Khaled Bataineh

Statistical Analyses and Modeling of the Implementation of Agile Manufacturing Tactics in Industrial Firms

This paper provides a review and introduction on agile manufacturing. Tactics of agile manufacturing are mapped into different production areas (eight-construct latent): manufacturing equipment and technology, processes technology and know-how, quality and productivity improvement, production planning and control, shop floor management, product design and development, supplier relationship management, and customer relationship management. The implementation level of agile manufacturing tactics is investigated in each area. A structural equation model is proposed. Hypotheses are formulated. Feedback from 456 firms is collected using five-point-Likert-scale questionnaire. Statistical analysis is carried out using IBM SPSS and AMOS. Multicollinearity, content validity, consistency, construct validity, ANOVA analysis, and relationships between agile components are tested. The results of this study prove that the agile manufacturing tactics have positive effect on the overall agility level. This conclusion can be used by manufacturing firms to manage challenges when trying to be agile.

2D Navier–Stokes Simulations of Microscale Viscous Pump With Slip Flow

In this paper we provide numerical solution of the Navier―Stokes equations coupled with energy equation for gaseous slip flow in two-dimensional microscale viscous pumps. A first-order slip boundary condition was applied to all internal solid walls. The objectives are to study the performance of the pumps and to study the effect of velocity slip on its performance. Mass flow rate and pump efficiency were calculated for various pump operation conditions when an external pressure load is applied at the pump exit plane. Geometric parameters were held fixed in this work. Microviscous pump performance was studied in detail for several values of the Reynolds number, pressure load, eccentricity, and slip factors. Our numerical results for no-slip were compared with previously published experimental and numerical data and were found to be in very good agreement. Slip values and eccentricity were found to be major parameters that affect the performance of pump. Pump head decreases with increasing slip factors. Maximum pump efficiency increases with increasing slip factor up to Kn approaching 0.1. However, the maximum value of pump efficiency is found to experience a steep degradation for Kn approaching 0.1. The values of moment coefficient always decrease as both slip factor and distance of the rotor from the lower wall increase. Also, as slip factors and distance of the rotor from the lower wall increase, less net ffow rate is predicted. For a given fired driving force at the rotor surface, there is an optimum value for the behavior of pump efficiency with distance of the rotor from the lower wall. Future research should be conducted to modify the current design to make this concept work for higher Knudsen number.

Thermal performance of building attached sunspace in Jordan climate

The thermal performance of a sunspace attached to living room located in Amman -Jordan has been investigated in the present study. DEROB- LTH is used to estimate the thermal performance in terms of cooling and heating loads required for the indoor climate. The annual heating and cooling loads are obtained under climatological prevalent conditions. The main contribution of this passive solar design is to reduce heating loads in winter and to minimize overheating during summer period. Six configurations that differ by the ratio of glazed surface area to opaque surfaces area are studied. The effect of orientation of sunspace, opaque wall and floor absroptivity coefficients and number of glass layers on the thermal performance is evaluated. Results show that the sunspace reduces the heating load during the winter while it creates a serious overheating problem during summer. The contribution of reducing heating requirement increases with increasing the ratio of glazed surface to opaque surface area. Also the optimal contribution obtained when sunspace oriented to the south. Two passive cooling techniques are proposed and evaluated to overcome the summer overheating problem. Also, a passive heating technique is proposed to minimize the thermal losses during winter nighttime. Internal shading and night ventilation successfully minimize the overheating problem. Employing the three passive techniques with sunspace, results show that as high as 42% reductions in annual heating and cooling load can be achieved when single clear glass sunspace oriented to the south.

Mutually dependent multi-criteria decision making

In this paper, a model to estimate the weights of mutually dependent criteria, based on cause-effect assessments of a group of professionals, is developed for problem of multiple criteria decision making (MCDM). Here, both DEMATEL (Decision Making Trial and Evaluation Laboratory) and TOPSIS (Technique for Order Performance by Similarity to Ideal Solution) models are combined and extended to handle fuzzy evaluations where the first is used to set the weights of the interdependent criteria and the second for drawing a decision from a group of professionals who use linguistic ratings in their evaluation.The presented model is characterized by the capability to estimate the criteria weights when the criteria are interrelated. The strict determination of the criteria weights prior to the assessment process is eliminated as they are computed by the DEMATEL part. A classical case-study of optimal sore throat treatment in primary care unit is used to demonstrate the efficiency of the proposed model.

Microscale Falling Cylinder Viscometer With Slip Boundary

This paper theoretically investigates the hydrodynamic behavior of a falling microcylinder viscometer. The Navier slip conditions are applied to all fluid/solid interfacial boundary conditions of the device. Previous investigations focused on the behavior at the macroscale level and did not consider the slip conditions. The slip coefficients for typical devices and operatireg conditions are found to be major parameters that affect the behavior of the microscale viscometer. Formulas for determining the viscosity coefficients using a microscale viscometer without considering slip conditions give inaccurate results. The theoretical model has been verified by comparing its predictions with that of the macroviscometer after neglecting the slip conditions.

Recent trends in solar thermal sorption cooling system technology

Solar thermal cooling is the best alternative solution to overcome the problems associated with using nonrenewable resources. There are several thermal cooling methods developed differing from each other according to the thermodynamic cycle and type of refrigerant used. Recent developments in absorption and adsorption solar cooling systems are presented. Summarized thermodynamic modeling for both absorption and adsorption solar cooling systems is given. Brief thermal analysis among the types of solar collectors is presented. System efficiencies and optimization analysis are presented. The influences of geometrical, system configurations, and physical parameters on the performance of solar thermal sorption cooling system are investigated. The basis for the design of absorption and adsorption solar cooling systems is provided. Several case studies in different climatic conditions are presented. Economic feasibility for both systems is discussed. Comparison between the absorption and adsorption solar cooling system is summarized.

Transient Analytical Model of a Solar-Assisted Indoor Swimming Pool Heating System

AbstractThis study deals with the thermal performance of a solar-assisted heating system for the Jordan University of Science and Technology indoor Olympic swimming pool. Solar heating is accomplished by using hot water generated by heat exchange with the solar evacuated tube collector working fluid. A transient analytical approach has been adopted for developing an explicit expression for the pool temperature, including all thermal losses. Detailed computations have been made from the beginning of September until the end of May. The effect of relevant parameters such as collector area, heat removal factors, collector heat loss coefficient, and evaporation losses on the performance of the proposed systems is investigated. The effect of covering the pool has been manifested in the analysis to reduce heat losses. The percentage of primary energy savings is used to measure the performance of the system. It is found that using a collector area equal to 53% of the pool surface results in 100% savings in primar...

Numerical Simulations for Average Temperature Differential Stirling Engine

A second order mathematical model taken into account thermal losses for average temperature differential Stirling engine is developed. Dynamic simulation of the engine based on mathematical formulation is carried out under different operating and geometrical conditions to investigate the engine performance. The developed model is used to investigate the influence of geometrical and physical parameters on the performance of Stirling engine. Design optimization of Stirling engine is carried out. Finally optimal parameters have been determined

Novel rotating cone viscous micro pump

This paper presents numerical solution for Navier-Stokes equations coupled with energy equation for gaseous slip flow between two concentric micro rotating cone pump. The inner cone is rotating while the outer is held stationary. A first-order slip boundary condition is applied. The effect of Kn, rotational speed and cone angle on pressure rise, flow rate, coefficient of moments and pump efficiency are studied. Slip values are found to be major parameters that affect the performance of pump. Four values of Kn are studied; Kn = 0, 0.001, 0.01 and 0.1. Optimal pump performance corresponds to Kn = 0.01. For all values of Kn, pressure rise is inversely proportional to flow rate. Increasing Kn reduces the slope of ΔP – Q curves. Both maximum flow rate and maximum pressure rise increase with rotational speed. Three values of cone angle b were studied, namely, 9°, 14° and 18°. Optimal performance is obtained for b = 14°.

THE MODULE OF TWO-CHORD DIAGRAMS FOR ORIENTED KNOTS OF ZERO WINDING NUMBER IN THE SOLID TORUS

In this paper we study the ℤ-module A2 of two-chord diagrams for knots with zero winding number in the solid torus KST0, which is needed in studying the type-two invariants for knots in KST0. We show that this module (or abelian group), which is given as a presentation with infinite number of generators and an infinite number of relations, is a free infinitely generated module. Moreover, we show that this module is isomorphic to the direct sum of three free modules that are easier to understand.